A: It refers to the dual-column synchronization system. The manual explains that the primary column sends position data to the secondary column 10 times per second to ensure level lifting.
| Interval | Action | Details | |----------|--------|---------| | | Visual inspection | Check hoses, cables, hooks, and pads for damage or wear. | | Weekly | Function test | Run full raise/lower cycle without load. Listen for unusual noises. | | Monthly | Lubrication | Apply lithium grease to pivot pins, chain links, and roller guides. | | Quarterly | Hydraulic oil level check | Remove filler cap; oil should be visible at the center of the sight glass. Top up with ISO VG 32. | | Annually | Hydraulic oil change | Drain completely, flush with clean oil, refill with 3.5 liters of HLP 32. | | Biennially (2 years) | Safety valve test | Use a calibrated pressure gauge to verify relief valve setting (max 180 bar). | | 5 years | Hose replacement | Replace all hydraulic hoses, regardless of condition (rubber degrades internally). | hofmann duolift gte 2500 manual
| Problem | Likely Cause (from manual) | Solution | |---------|----------------------------|----------| | Column won’t raise, no power light | Blown fuse or tripped breaker | Check building electrical panel. Replace 16A fuse. | | One column raises slower than other | Synchronization cable damaged or unplugged | Inspect cable for cuts. Replace if needed. Ensure plugs are fully seated. | | Motor runs but no lift | Low hydraulic oil or clogged suction filter | Check oil level. Clean suction strainer (manual section 7.4). | | Load drifts downward slowly | Internal cylinder seal failure | Do not use. Contact Hofmann service for seal kit replacement (part # 874-32-110). | | Loud grinding noise when raising | Dry chain or worn sprocket | Lubricate chain. If noise persists, inspect sprocket teeth (manual diagram 9-12). | | Emergency stop won’t reset | Button mechanism stuck | Remove mushroom head, clean with contact cleaner, reinstall. | A: It refers to the dual-column synchronization system
| Specification | Value (as per manual) | |---------------|-----------------------| | Lifting capacity per column | 2,500 kg (5,511 lbs) | | Total system capacity (2 columns) | 5,000 kg (11,023 lbs) | | Lifting height (max) | 1,750 mm (68.9 inches) | | Lowered height | 150 mm (5.9 inches) | | Lifting time (full stroke) | Approx. 35 seconds | | Motor rating | 2.2 kW per column | | Power supply | 400V / 3-phase / 50 Hz | | Protection class | IP 54 | | Noise level | < 70 dB(A) | | | Weekly | Function test | Run